dyson



C. W. DYSON.

LIQUID HEATER AND VAPORIZER.

APPLICATION FILED JULY 2,1919.

' Patented Oct. 7,1919.

2 SHEETSSHEET l.

C. W. DYSON.

LIQUID HEATER AND VAPORIZER.

APPLICATION FILED JULY 2.1919.

Patented Oct. 7,1919. 2 SHEETSSHEET 2 5 0 Q9 7 0 Q QQ @Q as Q Q a M @0 Q0. Q0 w QQQQQQQQQQQQQQQQ @QQQQQQQQ QQQQ @QQQQQQQQQQQQQQQ @QQQQQQQQQQQQQ 6 5mm @Mrlesfiiflysom by ZzML/ZZM/ Hum/nu;

NITED STAT LIQUID HEATER AND VAPORIZER.

Specification of Letter s'Patent.

Patented Got. 7, 1919.

Application filed July 2, 1919. Serial No. 308076.

To all whom it may concern:

Be it known that I, CHARLES W. DYsoN, a citizen of the United States, residing at Washington, in the District of Columbia, have invented certain new and useful Improvements in Liquid Heaters and Vaporizers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it app rtains to make and use the same.

This invention relates to liquid heaters and Vaporizers, and more particularly to steam boilers of the so-called express type, and superheaters therefor, and has for its object to'provide such a boiler with a superheater that will be comparatively simple in constructiom'and more easy to repair, and more efficient in use than those heretofore proposed.

With these and other objects in view the invention consists in the novel details of construction and combinations of parts more fully hereinafter disclosed and particularly pointed out in the claims.

Referring to the accompanying drawings forming a part of this specification in which like numerals designate like parts in all the views 'Figure 1 is a view,-partly in front elevation, and partly in vertical section, of a water tube boiler, and superheater made in accordance with this invention;

Fig. 2 is an enlarged sectional detail view of a readily detachable fastening means between the superheater and boiler;

Fig. 3 is asection through the line 33 of Fig. 1;

Fig. 4 is an enlarged sectional detail view of a detachable fastening means between the lower boiler drum and the lower superheater drum;

Fig. 5 is a sectional view taken on the line 5-5 of Fig. 1, looking inthe direction of the arrows; and

Fig. 6 is a development of a portion of the superheater drum, showing the arrangement of the holes for the tubes therein.

1 indicates a Water tube boiler of the so called express type, provided with an upper drum 2, and with the usual lower drums 3, only one b ing shown, and a suitable firebox 5. The drum 2 is perforated in the usual manner to receive the upper ends of the usual sets of water tubes 6, only one set being shpwn, and the lower ends of which are suitably introduced into the drum 3, as illustrated.

8 represents one of the upper drums of a superheater 9, associated with a set of water tubes 6, and 10, one of the lower drums 14, which are so curved and nested among the water tubes 6 as to attain the objects heretofore set forth, all as will now appear.

Referring more particularly to Figs. 1, 5 and 6, the tubes such as 6 which constitute the steam generating portions of the boiler, are arranged in lateral rows such as 15 and 16, the alternate rows 16 being preferably in staggered relation to the rows 15 as shown. A predetermined number of these said rows have more or less of their outer tubes omitted, thereby forming open spaces or lanes 17 indicated by broken lines between the remaining rows which contain the full number of tubes.

The tubes 14 of the superheater are so located in their drums 8 and 10 that when the superheater is in place, as shown in Figs. 1 and 5, the said tubes 14 will enter into and occupy the said open spaces or lanes 17, made by omitting certain tubes in the rows of steam generating tubes 6 as will be readily apparent. To this end the superheater tubes 14 are arranged in lateral rows which for the sake of clearness I have numbered 18, in Figs. 5 and 6. The distance between adjacent rows 18 is preferably the same as the space between the lanes 17 in the steam generating tubes 6, so that the said rows of superheater tubes 18 may readily enter and be withdrawn from the said lanes 17 by a mere lateral movement of the entire superheater 9, as indicated in dotted lines in Fig. 1.

The number of tubes 6 omitted from the rows 15 and 16, as well as the number of tubes 14, contained in the rows 18, will depend to a great extent upon the degree of superheat it is desired to obtain.

That is to say, by omitting more tubes 6 from the rows 15 and 16, and adding correspondingly to the number of tubes 14: contained in the rows 18, a greater superheating surface may be obtained with a corresponding increase of superheated steam.

It will therefore be apparent that it is possible to vary the ratio between the steam generating surface and the superheating surface wlthin wide limits, even to the point where the one is equal to the other. This ratio, however, will depend upon the requirements of each particular case and may be readily calculated in advance.

The steam generating tubes 6 may be made to enter the drums 2 and 3, in any preferred manner, but are here illustrated as entering the said drums along radial lines. By nesting the tubes 14 of the superheater in the lanes 17, that I provide among the tubes 6 of the boiler, the lower drum 10 of the said superheater may be brought almost entirely within the lateral limits required by the said tubes 6, thereby increasing the total width of the boiler little, if any.

Further, the nesting of single rows 18 of the superheater tubes 14 in the individual lanes 17 distributed among the steam generating tubes 6, protects the said superheater tubes to 'a greater extent than heretofore, from the corrosive effects of the furnace gases, thus, prolonging their life, and reducing the upkeep of the heater.

Again, should it become necessary to replace or repair the superheater tubes 14, the entire superheater may be made readily accessible by merely moving the same laterally as indicated in dotted lines Fig. 1, and thus withdrawing its tubes from the lanes 17 of the boiler tube 6. The existence of the said lanes 17 among the boiler tubes 6 also facilitates the repair of the said tubes 6 when that is necessary.

The superheater drums 10 are preferably provided with the usual axial distributing pipes 20, extending sufliciently far into said drums to insure a substantially equal flow of steam through the tubes 14', by providing a practically even distribution of the steam as it enters the said drums. If desired, the upper drums 8 may be provided with simi lar pipes (not shown) to secure an even extraction of the superheated steam. The lower drums 10 may also be fitted with any well known suitable means for draining and also with well known means for flooding and pumping out the superheater, if desired.

In order to facilitate the ready removal of the rows 18 of superheater tube 14 from the lanes 17 of the boiler tubes 6, I make the fastening means 25 between the drums 2 and 8, readily attachable and detachable as illustrated in Fig. 2. That. is to say, I may secure the brackets or members 26 to thedrum 2 as by the bolts 27 having the heads or nuts 28. I secure the brackets or members 29 to the drum 8 by the bolts 30 having the heads or nuts 31, and I secure the members 26 and 29 together as by the bolt 32, having the heads or nuts 33. Of course, any

other suitable readily attachable and detacha ble means may be employed if desired.

In the same way between the drums 3 and 10, I secure the members 34 and 35 to said drums respectivelyby the detachable bolts 36 and 37 and I secure the said members 34 .43. It is therefore obvious that by merely removing a few readily detachable fastening means such as the bolts 29, 30, 39 and 43, I

may at any time swing the superheater tubes 14 from their full line positions over into their dotted line positions shown in Fig. 1.

I prefer to add to the superheater tubes the outer row of tubes 45 which lie outside the boiler tubes 6, and serve to act as bafiles for the hot gases, and therefore, to absorb a considerable portion of heat which otherwise would escape.

It will now be clear :First, that the foregoing construction makes not only the superheater tubes, but also a large proportion of the boiler tubes readily accessible for repairs. For itis only necessary to swing the superheater into its dotted line position, shown in Fig. 1, to so expose both sets of tubes that they may be readily reached for renewal and re airs.

Second, that the tubes are so arranged and curved as to permit the location of the lower superheater drum below and under said tubes, and therefore, the total width of the boiler maybe made a minimum while comparatively straight leads are provided for the superheater tubes.

Third, that the superheater tubes areso disposed in relation to the boiler tubes, as to produce a maximum of efliciency in the superheater. This constitutes a most important feature of myinvention, and is brought about by locating each superheater tube in a row 18 in close proximity to a plurality of boiler tubes, so that it is subjected to the same degree of heat as the latter.

Fourth, that any desired ratio between the boiler and superheater surfaces may be readily provided, even up to unity without changing the outside dimensions of the boiler. And, fifth, the arrangement adapted. greatly tends to lesseh internal as well as external corrosion of the superheater tubes.

It is obvious that those skilled in the art may vary the details of construction, as well as the arrangement of parts without departing from the spirit of the invention,

and therefore, I do not wish to be limited to v the above disclosure except as may be re quired by the claims.

What I claim is 1. In a boiler the combination of an upper and a lower drum; a set of curved steam. generating tubes joining said drums and so arranged as to provide a plurality of open ended lanes extending lengthwise of said tubes; an upper and a lower superheater drum; a set of superheater tubes joining said superheater drums, arranged in a plurality of rows; so spaced apart as to be capabls'e of entering said lanes; asaddle in which 7 said lower superheater drum rests; readily detachable means securing said lower su-perheater drum to said first named lower drum; and readil detachable means for securin said superlieater drum to said first name upper drum, substantially as described.

2. In a boiler the combination of an upper and a lower drum; a set of curved steam generating tubes joining said drums and S0 arranged as to provide a plurality of open ended lanes extending lengthwitse of said tubes; an upper and a loWer superheater drum; a set of curved superheater tubes joining said superheater drums, arranged in a plurality of rows so placed apart as to be capable of entering said lanes; a saddle in which said lower superheater drum rests; readily detachable means for securing said lower superheater drum against rotation in said saddle; readily detachable means securing said lower superheater drum to said first named lower drum; and readily detachable means for securing said superheater drum to said first named upper drum, sub-' stantially as described.

3. In a boiler the combination of an upper and a lower drum; a set of curved steam generating tubes joining said drums and so arranged as to provide a plurality of open ended lanes extending lengthwise of said tubes; an upper and a lower. superheater drum; a set of superheater tubes joining said superheater drums arranged in a plurality of rows of single tubes 50 spaced apart as to be capable of. entering said lanes; a saddle in which said lower superheater drum rests; readily detachable means for securing said lower superheater drum to said first named lower drum; and readily detachable means for securing said upper superheater drum to said first named upper drum, substantially as described.

4. In a boiler the combination of an upper and a lower drum; a set of curved steam generating tubes joining said drums and so generator tubes each lane being separated from its adjacent lane by a staggere double row of said tubes; an 11 per an a lower superheater drum; super eater tubes curvedin a direction opto the curvature of said generating tubes disposed in single rows joining said superheater drums, and adapted to enter said lanes whereby each row of superheater tubes is subjected to ases of the same temperature as are the tu es of each row of the adjacent generating tubes; a saddle in which said lower. superheater drum is adapted to swing; readily detachable connections between said' last named and said first named lower drums; and readily detachable connections between said first named upper drum and said upper superheater drum, substantially as described. e

5. In a boiler the combination of upper and lowerdrums; a set of outwardly curved connecting said drums and so arranged as to provide a pluralit of open lanes for the reception of opposite y curved superheater tubes, an upper superheater 'drum in close proximity to said first named so I upper drum; a lower superheater drum;

superheater tubes curved in a direction opposite to that of the generator tubes joining said superheater drums; and disposed in a plurality of rows in said lanes; detachable means connecting said upper drums; and detachable means connecting said lower drums, substantially as described...

6. In a boiler the combination of upper and lower drums; a set of outwardly curved generator tubes connecting said drums and so arranged as to provide a plurality'of open lanes for the reception of oppositely curved superheater tubes; an upper superheater drum in close proximity to said first named upper drum; a lower superheater drum; superheater tubes curved in a direction opposit'e to that of the generator tubes joining said superheater drums, and disposed in a pluralityof rows in said lanes; an additional set of superheater tubes acting as bafileslocated outside said lanes; detachable means connecting said upper drums; and detachable means connecting said lower'drums, substantially as described.

In testimony whereof I aflix my signature in presence of two witnesses.

CHARLES w. bYsoN.

Witnesses:

G. H. SWYGERT, W. N. EATON. 

